www.sera-web.com
19
OPERATION
Pre-alarm
Dry run
Pre-alarm, dry run
The connection of a
sera
suction lance enables the monitoring of the fill
level of the dosing tank:
Settings can be made for the following items:
■
Pre-alarm
■
Dry run
Configuration of the two level inputs. You can choose between switching
off (OFF) the input or configuring the input as NORMALLY CLOSED (=
floating opening NO) or NORMALLY OPEN (= floating closing NC).
The factory setting for both level inputs is NORMALLY OPEN
Configuration
Pre-alarm
Dry run
1
NC
NC
2
NC
NO
3
NO
NO
■
Configuration 1
This configuration is preset at the factory. A 1-stage or 2-stage level monitor with floating normally open contacts (pre-alarm
+ dry run or only dry run) can be connected.
■
Configuration 2
This configuration must be selected if a 1-stage level monitor (dry run only) with floating normally closed contact is connect-
ed.
■
Configuration 3
This configuration must be selected if a 2-stage level monitor with floating normally closed contacts (pre-alarm + dry run) is
connected.
Slow mode (stepper motor pump)
In Slow mode, the pump is operated at reduced speed in the suction
stroke.
This is useful, for example, when pumping highly viscous media.
The speed of the suction stroke can be set to 75, 50 or 25% of the normal
suction stroke speed.
Due to the reduced suction stroke speed, the maximum configurable de-
livery rate reduces (see "Technical Data" in the operating manual of the
pump).
The Slow Mode symbol is shown on the Home display.
